Electric attachment-plug.



T MQHERSKOVITZ.

BLEOTRIG ATTACHMENT PLUG.

APPLIOATION FILED JUNE 14, 1912.

1,0423, Patented 0011221912.

' innit-nth snares FATENE enrich.

MAX HERSKOVITZ, OF CHICAGO, ILLINOIS, ASSIGNOB F ONE-HALF TO 0. W.HENGER,

OF WATERTGWN, CONNECTICUT.

ELECTRIC ATTACHMENT-PLUG.

Patentedflct. carers.

, Application filed June 14, 1912. Serialrl'o. 763,738.

To all whom it may concern:

Be it known that I, MAX Hnnsnovirz, a citizen of the United States,residing at Chicage, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Electric Attachment- Plugs, ofwhich the following is a specification.

My invention relates to electrical attachment plugs and contemplatesimproved and more desirable construction.

My invention concerns particularly that class of plugs which comprise abody carrying conductor terminals, and a threaded sleeve rotatable onthe body and in electrical connection with one of the terminals. Asheretofore constructed, the body has a threaded neck extending throughthe head of the sleeve to be engaged by a threaded cap through which thecircuit conductors enter to connect with the terminals on the body, thiscap then looking the sleeve to the body but allowing rotation of thesleeve to.

enable it to be screwed into a socket without causing turning of thebody. In practice, however, these caps are apt to bind on the sleeve toprevent rotation thereof, and turning or" the sleeve is also apt to wearon the conductor insulation. The cap, being of rubber, its threadsareeasily broken or distorted so that the cap will no longer fit. It alsorequires time to apply or to remove the cap. A sin, in this prior formof plug, the sleeve oes not have the most eflicient electrical contactwith its conductor terminal.

Among the objects of my invention are to provide a construction andarrangement which will dispense with the threaded neck on the body andwith the separate cap; to provide a construction in which the sleeve isfreely rotatable on the body but is always in eflicient electricalconnection with its con connect the sleeve and body and in which thesleeve spring clamps to the body, this being obtained by providing aperipheral groove on the body and tongues or projections on the sleeveto snap into the groove to loch the sleeve to the body but to permitfree rota- I tion' ofthe' sleeve; and in general, to provide s moresimple and more desirable and 'efi eient plug.

In the accompanying drawings :Figure 1 1s a top view; Fig.2 is a sideelevation;

Fig. 3 is 'a bottom view; Fig. -i is a side elevation of the body; Fig.5 is a section on line 5 5, Fig. 1; and Fig. 6 is a section on line 6-6,Fig. 5.

The body 10 is a cylinder of porcelain or other suitable insulatingmaterial and has the longitudinal passageway 11 for one circuitconductor and the longitudinal pocket 12 for the other conductor. In thebase of the body is a pocket 12 for receiving the binding screw 13, andthe countersink pocket 14 "for receiving the terminal plate 15, thewasher 16, and the head of the screw. A tubular rivet 16 is anchoredi-nthe lower end of passageway 11 and holds the plate 15 in place, theconductor passing through the passageway and rivet to be clamped betweenthe plate and the, washer.

Surrounding the upper end of the body is a sheet metal ring. 17 havingthe peripheral groove 18 and ridge 19, the ridge engag ing in a groove20 in the body to thus secure the ring to the body. A. terminal plate 21is secured to the ring 17 and extends downwardly into pocket- 14, apassageway 22 adjacent the pocket allowing the circuit conductor to beclamped to terminal plate 21 by the screw 23. I

The sleeve part'S comprises the cylindrical sheet metal shell 24 havingthe threads 25, the shell being deflected inwardly at various pointsnear its upper end to form tongues or ridges 26 for engaging in thegroove 20 of the body. lhe shell is sufficiently springy so that theridges will readily pass over the ring and willsnap into the groove tothen lock the sleeve in firm electrical engagement 7 with the ring whileat the same time the sleeve can freely turn on the body to be screwedinto a socket.

The upper edge of the shell is deflected inwardly to lie against theupper edge (if the ring, and is then deflected upwardly and outwardlytoform the peripheral groove 27 for clamping the inner flange 28 of thecap 29. This capis of insulating material and i has the central opening30 for the circuit conductors and is sulhciently raised over the body 10to allowlrn'otting of the conductors if desired, or application of acord grip for relievingthe, body terminalsof all strain.

'ihe periphery of the outer flange 31 onv the being then in 32 may beapplied and tween the shell cap is knurled so that the sleeve structurecan be readily turned to secure the shell in a socket.

In Fig. 4, the body is shown alone. When the plug is to be assembled,thecircuit conductors are passed through. the cap opening 30 and theninto the passageways of the body and secured to the terminal plates. Thesleeve structure is then slippedover the body and pressed down until theridges 26 snap into the groove 18,'tl1e sleeve structure firm electricalconnection with the ring 17 and withthe terminal plate 21 extendingtherefrom. The sleeve structure being freely rotatable on the body afterclamping thereto, the shell 24 can be readily screwed into a socket toengage one terminal thereof and to carry the body end terminal intoengagement with the other terminal of the socket.

To disconnect the sleeve structure and body they are merely pulled apartand 110' relative turning is necessary. In order to insulate the outerend of the shell which will be outside of the socket, an insulating ringheld in place bethrcads and the cap. Inscrtion of the plug into a socketcan thus be safely accomplished.

I thus produce a siinple yet substantial plug having a minimum number ofparts and having a most eilicient electrical arrangement.

I do not desire to be limited to the construction modifications arepossible which would still come Within the scope of my invention.

I claim the following:

1. In an electrical attachment plug, the combination of a cylindricalbody having 'a peripheral groove, and a sleeve having projections forengaging in said groove to norexact mally hold the body and sleevetogether but to allow free relative rotation thereof, said groove andprojection connection being yielding-to allow the parts to be separatedby abnormalv pull thereon.

vf2. In an electrical attachment plug, the combination of a cylindrical.body of insulating matcriah'contact terminals on said body, a ringsurrounding said body'and having a peripheral groove and a threaded saidterminal and arrangement shown as noaaeae metallic sleeve fitting overthe body and one of said consaid ring being 3. In an electricalattachment plug,the

combination of a cylindrical body carrying terminal contacts and havinga peripheral groove in a plane at right angles to the body axis, and athreaded metallic sleeve fitting over said body and having a projectionfor cooperating with said body groove to lock the sleeve to the body butto allow free rotation thereon, said sleeve when applied being inelectrical engagement withone of contacts.

a. In an electrical attachment plug, the combination of a cylindricalbody of insulating material, an end contact and a side contact carriedby said body, a metallic, head for said body having a peripheral grooveconcentric with the body axis, a threaded cylin-v drical shell receivingsaid body and-having inner projections groove to lock the allow freerotation shell when applied to the body having electrical connectionwith said side contact on the body.

5. In an electrical attachment plug, the combination of a cylindricalbody part, a cylindrical threaded sleeve part,'0ne of said parts havinga-groove angles to its axis and the other part havmg a projection forengaging at any point in said groove-to lock sald parts togetherbut toallow relative rotation thereof, said sleeve part forming one electricalterminal of the plug and said body mounting the other terminal of saidplug, and a cap rigid with the sleeve coverin the outer ends of saidsleeve part and p mg and having an opening for circuit'conductors.

In. witness whereof I have signed my name for engaging in said shell tothe body but to to the foregoing specification in the presence I of twosubscribing witnesses.

MAX HERSKOVITZ.

Witnesses:

R. J. JACKER, M. J. MOKEND Y.

Copies of this patent may be obtained for five cents each, byWashington, 3). G.

addressing the Commissioner of latents,

thereof on the body, said in a plane at ri ht

